A biomarker is a measurable substance that indicates the presence of life, past or present. In the search for extraterrestrial life, biomarkers can include specific gases, molecules, or other indicators in an environment that suggest biological activity.
Exoplanet: A planet located outside our solar system orbiting a star other than the Sun.
Astrobiology: The study of the origin, evolution, distribution, and future of life in the universe.
Spectroscopy: A technique used to analyze the light spectrum emitted or absorbed by materials to determine their composition.